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Finding the Fourth Proportional to 875.12, 1,207.64 and 476.78

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Solution

The fourth proportional to 875.12, 1,207.64 and 476.78 is: 657.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.12 : 1,207.64 = 476.78 : x
  2. Step 2: Convert to fraction form
    875.12/1,207.64 = 476.78/x
  3. Step 3: Cross multiply
    875.12x = 1,207.64 × 476.78
  4. Step 4: Simplify right side
    875.12x = 575,778.60
  5. Step 5: Solve for x
    x = 575,778.60/875.12
  6. Step 6: Final answer
    x = 657.94

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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.