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Finding the Fourth Proportional to 968.60, 1,337.56 and 619.90

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Solution

The fourth proportional to 968.60, 1,337.56 and 619.90 is: 856.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.60 : 1,337.56 = 619.90 : x
  2. Step 2: Convert to fraction form
    968.60/1,337.56 = 619.90/x
  3. Step 3: Cross multiply
    968.60x = 1,337.56 × 619.90
  4. Step 4: Simplify right side
    968.60x = 829,148.55
  5. Step 5: Solve for x
    x = 829,148.55/968.60
  6. Step 6: Final answer
    x = 856.03

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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.