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Finding the Fourth Proportional to 78,319.42, 117,479.12 and 74,973.31

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Solution

The fourth proportional to 78,319.42, 117,479.12 and 74,973.31 is: 112,459.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,319.42 : 117,479.12 = 74,973.31 : x
  2. Step 2: Convert to fraction form
    78,319.42/117,479.12 = 74,973.31/x
  3. Step 3: Cross multiply
    78,319.42x = 117,479.12 × 74,973.31
  4. Step 4: Simplify right side
    78,319.42x = 8,807,798,482.29
  5. Step 5: Solve for x
    x = 8,807,798,482.29/78,319.42
  6. Step 6: Final answer
    x = 112,459.96

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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.