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Finding the Fourth Proportional to 7,428, 10,251.28 and 4,116.64

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Solution

The fourth proportional to 7,428, 10,251.28 and 4,116.64 is: 5,681.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,428 : 10,251.28 = 4,116.64 : x
  2. Step 2: Convert to fraction form
    7,428/10,251.28 = 4,116.64/x
  3. Step 3: Cross multiply
    7,428x = 10,251.28 × 4,116.64
  4. Step 4: Simplify right side
    7,428x = 42,200,829.30
  5. Step 5: Solve for x
    x = 42,200,829.30/7,428
  6. Step 6: Final answer
    x = 5,681.32

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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.