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Finding the Fourth Proportional to 7,643.55, 10,715.55 and 7,643.55

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Solution

The fourth proportional to 7,643.55, 10,715.55 and 7,643.55 is: 10,715.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,643.55 : 10,715.55 = 7,643.55 : x
  2. Step 2: Convert to fraction form
    7,643.55/10,715.55 = 7,643.55/x
  3. Step 3: Cross multiply
    7,643.55x = 10,715.55 × 7,643.55
  4. Step 4: Simplify right side
    7,643.55x = 81,904,842.20
  5. Step 5: Solve for x
    x = 81,904,842.20/7,643.55
  6. Step 6: Final answer
    x = 10,715.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.