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Finding the Fourth Proportional to 76,938.40, 115,407.60 and 72,637.60

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Solution

The fourth proportional to 76,938.40, 115,407.60 and 72,637.60 is: 108,956.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,938.40 : 115,407.60 = 72,637.60 : x
  2. Step 2: Convert to fraction form
    76,938.40/115,407.60 = 72,637.60/x
  3. Step 3: Cross multiply
    76,938.40x = 115,407.60 × 72,637.60
  4. Step 4: Simplify right side
    76,938.40x = 8,382,931,085.76
  5. Step 5: Solve for x
    x = 8,382,931,085.76/76,938.40
  6. Step 6: Final answer
    x = 108,956.40

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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.