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Finding the Fourth Proportional to 875.84, 1,312.64 and 659.84

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Solution

The fourth proportional to 875.84, 1,312.64 and 659.84 is: 988.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.84 : 1,312.64 = 659.84 : x
  2. Step 2: Convert to fraction form
    875.84/1,312.64 = 659.84/x
  3. Step 3: Cross multiply
    875.84x = 1,312.64 × 659.84
  4. Step 4: Simplify right side
    875.84x = 866,132.38
  5. Step 5: Solve for x
    x = 866,132.38/875.84
  6. Step 6: Final answer
    x = 988.92

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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.