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Finding the Fourth Proportional to 10,642.80, 15,935.40 and 7,705.20

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Solution

The fourth proportional to 10,642.80, 15,935.40 and 7,705.20 is: 11,536.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,642.80 : 15,935.40 = 7,705.20 : x
  2. Step 2: Convert to fraction form
    10,642.80/15,935.40 = 7,705.20/x
  3. Step 3: Cross multiply
    10,642.80x = 15,935.40 × 7,705.20
  4. Step 4: Simplify right side
    10,642.80x = 122,785,444.08
  5. Step 5: Solve for x
    x = 122,785,444.08/10,642.80
  6. Step 6: Final answer
    x = 11,536.95

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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.