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Finding the Fourth Proportional to 487,293.30, 730,830.60 and 319,987.80

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Solution

The fourth proportional to 487,293.30, 730,830.60 and 319,987.80 is: 479,909.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,293.30 : 730,830.60 = 319,987.80 : x
  2. Step 2: Convert to fraction form
    487,293.30/730,830.60 = 319,987.80/x
  3. Step 3: Cross multiply
    487,293.30x = 730,830.60 × 319,987.80
  4. Step 4: Simplify right side
    487,293.30x = 233,856,875,866.68
  5. Step 5: Solve for x
    x = 233,856,875,866.68/487,293.30
  6. Step 6: Final answer
    x = 479,909.89

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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.