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Finding the Fourth Proportional to 487.80, 672.48 and 429.48

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Solution

The fourth proportional to 487.80, 672.48 and 429.48 is: 592.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.80 : 672.48 = 429.48 : x
  2. Step 2: Convert to fraction form
    487.80/672.48 = 429.48/x
  3. Step 3: Cross multiply
    487.80x = 672.48 × 429.48
  4. Step 4: Simplify right side
    487.80x = 288,816.71
  5. Step 5: Solve for x
    x = 288,816.71/487.80
  6. Step 6: Final answer
    x = 592.08

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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.