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Finding the Fourth Proportional to 870.69, 1,201.55 and 477.70

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Solution

The fourth proportional to 870.69, 1,201.55 and 477.70 is: 659.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.69 : 1,201.55 = 477.70 : x
  2. Step 2: Convert to fraction form
    870.69/1,201.55 = 477.70/x
  3. Step 3: Cross multiply
    870.69x = 1,201.55 × 477.70
  4. Step 4: Simplify right side
    870.69x = 573,980.44
  5. Step 5: Solve for x
    x = 573,980.44/870.69
  6. Step 6: Final answer
    x = 659.22

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.