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Finding the Fourth Proportional to 78,007.80, 117,062.10 and 42,972.60

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Solution

The fourth proportional to 78,007.80, 117,062.10 and 42,972.60 is: 64,486.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,007.80 : 117,062.10 = 42,972.60 : x
  2. Step 2: Convert to fraction form
    78,007.80/117,062.10 = 42,972.60/x
  3. Step 3: Cross multiply
    78,007.80x = 117,062.10 × 42,972.60
  4. Step 4: Simplify right side
    78,007.80x = 5,030,462,798.46
  5. Step 5: Solve for x
    x = 5,030,462,798.46/78,007.80
  6. Step 6: Final answer
    x = 64,486.66

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1.5x scale

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.