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Finding the Fourth Proportional to 390,061.80, 584,108.55 and 311,329.80

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Solution

The fourth proportional to 390,061.80, 584,108.55 and 311,329.80 is: 466,209.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,061.80 : 584,108.55 = 311,329.80 : x
  2. Step 2: Convert to fraction form
    390,061.80/584,108.55 = 311,329.80/x
  3. Step 3: Cross multiply
    390,061.80x = 584,108.55 × 311,329.80
  4. Step 4: Simplify right side
    390,061.80x = 181,850,398,049.79
  5. Step 5: Solve for x
    x = 181,850,398,049.79/390,061.80
  6. Step 6: Final answer
    x = 466,209.20

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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.