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Finding the Fourth Proportional to 8,642.79, 12,964.14 and 5,720.40

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Solution

The fourth proportional to 8,642.79, 12,964.14 and 5,720.40 is: 8,580.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,642.79 : 12,964.14 = 5,720.40 : x
  2. Step 2: Convert to fraction form
    8,642.79/12,964.14 = 5,720.40/x
  3. Step 3: Cross multiply
    8,642.79x = 12,964.14 × 5,720.40
  4. Step 4: Simplify right side
    8,642.79x = 74,160,066.46
  5. Step 5: Solve for x
    x = 74,160,066.46/8,642.79
  6. Step 6: Final answer
    x = 8,580.57

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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.