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Finding the Fourth Proportional to 319,317.72, 478,987.89 and 79,432.86

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Solution

The fourth proportional to 319,317.72, 478,987.89 and 79,432.86 is: 119,152.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,317.72 : 478,987.89 = 79,432.86 : x
  2. Step 2: Convert to fraction form
    319,317.72/478,987.89 = 79,432.86/x
  3. Step 3: Cross multiply
    319,317.72x = 478,987.89 × 79,432.86
  4. Step 4: Simplify right side
    319,317.72x = 38,047,378,008.07
  5. Step 5: Solve for x
    x = 38,047,378,008.07/319,317.72
  6. Step 6: Final answer
    x = 119,152.10

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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.