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Finding the Fourth Proportional to 679,920.80, 1,019,006.40 and 413,398.40

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Solution

The fourth proportional to 679,920.80, 1,019,006.40 and 413,398.40 is: 619,565.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,920.80 : 1,019,006.40 = 413,398.40 : x
  2. Step 2: Convert to fraction form
    679,920.80/1,019,006.40 = 413,398.40/x
  3. Step 3: Cross multiply
    679,920.80x = 1,019,006.40 × 413,398.40
  4. Step 4: Simplify right side
    679,920.80x = 421,255,615,349.76
  5. Step 5: Solve for x
    x = 421,255,615,349.76/679,920.80
  6. Step 6: Final answer
    x = 619,565.71

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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.