Home / 78,735.61-118,151.21-31,987.27

Finding the Fourth Proportional to 78,735.61, 118,151.21 and 31,987.27

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Solution

The fourth proportional to 78,735.61, 118,151.21 and 31,987.27 is: 48,000.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,735.61 : 118,151.21 = 31,987.27 : x
  2. Step 2: Convert to fraction form
    78,735.61/118,151.21 = 31,987.27/x
  3. Step 3: Cross multiply
    78,735.61x = 118,151.21 × 31,987.27
  4. Step 4: Simplify right side
    78,735.61x = 3,779,334,655.10
  5. Step 5: Solve for x
    x = 3,779,334,655.10/78,735.61
  6. Step 6: Final answer
    x = 48,000.32

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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.