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Finding the Fourth Proportional to 77,445.40, 115,908.90 and 54,117.40

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Solution

The fourth proportional to 77,445.40, 115,908.90 and 54,117.40 is: 80,994.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,445.40 : 115,908.90 = 54,117.40 : x
  2. Step 2: Convert to fraction form
    77,445.40/115,908.90 = 54,117.40/x
  3. Step 3: Cross multiply
    77,445.40x = 115,908.90 × 54,117.40
  4. Step 4: Simplify right side
    77,445.40x = 6,272,688,304.86
  5. Step 5: Solve for x
    x = 6,272,688,304.86/77,445.40
  6. Step 6: Final answer
    x = 80,994.98

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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.