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Finding the Fourth Proportional to 867.60, 1,298.16 and 661.86

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Solution

The fourth proportional to 867.60, 1,298.16 and 661.86 is: 990.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.60 : 1,298.16 = 661.86 : x
  2. Step 2: Convert to fraction form
    867.60/1,298.16 = 661.86/x
  3. Step 3: Cross multiply
    867.60x = 1,298.16 × 661.86
  4. Step 4: Simplify right side
    867.60x = 859,200.18
  5. Step 5: Solve for x
    x = 859,200.18/867.60
  6. Step 6: Final answer
    x = 990.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.