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Finding the Fourth Proportional to 858,698.70, 1,288,048.05 and 219,001.20

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Solution

The fourth proportional to 858,698.70, 1,288,048.05 and 219,001.20 is: 328,501.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,698.70 : 1,288,048.05 = 219,001.20 : x
  2. Step 2: Convert to fraction form
    858,698.70/1,288,048.05 = 219,001.20/x
  3. Step 3: Cross multiply
    858,698.70x = 1,288,048.05 × 219,001.20
  4. Step 4: Simplify right side
    858,698.70x = 282,084,068,607.66
  5. Step 5: Solve for x
    x = 282,084,068,607.66/858,698.70
  6. Step 6: Final answer
    x = 328,501.80

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.