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Finding the Fourth Proportional to 85,712.52, 128,574.80 and 26,540.40

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Solution

The fourth proportional to 85,712.52, 128,574.80 and 26,540.40 is: 39,812.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,712.52 : 128,574.80 = 26,540.40 : x
  2. Step 2: Convert to fraction form
    85,712.52/128,574.80 = 26,540.40/x
  3. Step 3: Cross multiply
    85,712.52x = 128,574.80 × 26,540.40
  4. Step 4: Simplify right side
    85,712.52x = 3,412,426,621.92
  5. Step 5: Solve for x
    x = 3,412,426,621.92/85,712.52
  6. Step 6: Final answer
    x = 39,812.46

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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.