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Finding the Fourth Proportional to 478,616.80, 717,269.10 and 390,043.30

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Solution

The fourth proportional to 478,616.80, 717,269.10 and 390,043.30 is: 584,530.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,616.80 : 717,269.10 = 390,043.30 : x
  2. Step 2: Convert to fraction form
    478,616.80/717,269.10 = 390,043.30/x
  3. Step 3: Cross multiply
    478,616.80x = 717,269.10 × 390,043.30
  4. Step 4: Simplify right side
    478,616.80x = 279,766,006,752.03
  5. Step 5: Solve for x
    x = 279,766,006,752.03/478,616.80
  6. Step 6: Final answer
    x = 584,530.27

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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.