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Finding the Fourth Proportional to 870.36, 1,201.19 and 497.39

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Solution

The fourth proportional to 870.36, 1,201.19 and 497.39 is: 686.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.36 : 1,201.19 = 497.39 : x
  2. Step 2: Convert to fraction form
    870.36/1,201.19 = 497.39/x
  3. Step 3: Cross multiply
    870.36x = 1,201.19 × 497.39
  4. Step 4: Simplify right side
    870.36x = 597,459.89
  5. Step 5: Solve for x
    x = 597,459.89/870.36
  6. Step 6: Final answer
    x = 686.45

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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.