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Finding the Fourth Proportional to 931.61, 1,285.50 and 558.52

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Solution

The fourth proportional to 931.61, 1,285.50 and 558.52 is: 770.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.61 : 1,285.50 = 558.52 : x
  2. Step 2: Convert to fraction form
    931.61/1,285.50 = 558.52/x
  3. Step 3: Cross multiply
    931.61x = 1,285.50 × 558.52
  4. Step 4: Simplify right side
    931.61x = 717,971.03
  5. Step 5: Solve for x
    x = 717,971.03/931.61
  6. Step 6: Final answer
    x = 770.68

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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.