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Finding the Fourth Proportional to 870.12, 1,201.20 and 609.52

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Solution

The fourth proportional to 870.12, 1,201.20 and 609.52 is: 841.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.12 : 1,201.20 = 609.52 : x
  2. Step 2: Convert to fraction form
    870.12/1,201.20 = 609.52/x
  3. Step 3: Cross multiply
    870.12x = 1,201.20 × 609.52
  4. Step 4: Simplify right side
    870.12x = 732,155.42
  5. Step 5: Solve for x
    x = 732,155.42/870.12
  6. Step 6: Final answer
    x = 841.44

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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.