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Finding the Fourth Proportional to 717,548.16, 990,211.86 and 395,250.78

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Solution

The fourth proportional to 717,548.16, 990,211.86 and 395,250.78 is: 545,443.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,548.16 : 990,211.86 = 395,250.78 : x
  2. Step 2: Convert to fraction form
    717,548.16/990,211.86 = 395,250.78/x
  3. Step 3: Cross multiply
    717,548.16x = 990,211.86 × 395,250.78
  4. Step 4: Simplify right side
    717,548.16x = 391,382,010,030.25
  5. Step 5: Solve for x
    x = 391,382,010,030.25/717,548.16
  6. Step 6: Final answer
    x = 545,443.54

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.