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Finding the Fourth Proportional to 520,320.80, 781,064.40 and 402,514.40

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Solution

The fourth proportional to 520,320.80, 781,064.40 and 402,514.40 is: 604,222.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,320.80 : 781,064.40 = 402,514.40 : x
  2. Step 2: Convert to fraction form
    520,320.80/781,064.40 = 402,514.40/x
  3. Step 3: Cross multiply
    520,320.80x = 781,064.40 × 402,514.40
  4. Step 4: Simplify right side
    520,320.80x = 314,389,668,327.36
  5. Step 5: Solve for x
    x = 314,389,668,327.36/520,320.80
  6. Step 6: Final answer
    x = 604,222.76

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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.