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Finding the Fourth Proportional to 128,012.52, 176,688.90 and 77,753.64

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Solution

The fourth proportional to 128,012.52, 176,688.90 and 77,753.64 is: 107,319.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,012.52 : 176,688.90 = 77,753.64 : x
  2. Step 2: Convert to fraction form
    128,012.52/176,688.90 = 77,753.64/x
  3. Step 3: Cross multiply
    128,012.52x = 176,688.90 × 77,753.64
  4. Step 4: Simplify right side
    128,012.52x = 13,738,205,122.60
  5. Step 5: Solve for x
    x = 13,738,205,122.60/128,012.52
  6. Step 6: Final answer
    x = 107,319.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.