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Finding the Fourth Proportional to 121,277.80, 181,916.70 and 79,287.40

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Solution

The fourth proportional to 121,277.80, 181,916.70 and 79,287.40 is: 118,931.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,277.80 : 181,916.70 = 79,287.40 : x
  2. Step 2: Convert to fraction form
    121,277.80/181,916.70 = 79,287.40/x
  3. Step 3: Cross multiply
    121,277.80x = 181,916.70 × 79,287.40
  4. Step 4: Simplify right side
    121,277.80x = 14,423,702,159.58
  5. Step 5: Solve for x
    x = 14,423,702,159.58/121,277.80
  6. Step 6: Final answer
    x = 118,931.10

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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.