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Finding the Fourth Proportional to 696,523.80, 961,213.85 and 390,668.20

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Solution

The fourth proportional to 696,523.80, 961,213.85 and 390,668.20 is: 539,128.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    696,523.80 : 961,213.85 = 390,668.20 : x
  2. Step 2: Convert to fraction form
    696,523.80/961,213.85 = 390,668.20/x
  3. Step 3: Cross multiply
    696,523.80x = 961,213.85 × 390,668.20
  4. Step 4: Simplify right side
    696,523.80x = 375,515,684,594.57
  5. Step 5: Solve for x
    x = 375,515,684,594.57/696,523.80
  6. Step 6: Final answer
    x = 539,128.29

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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.