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Finding the Fourth Proportional to 3,909.64, 5,864.30 and 1,312.50

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Solution

The fourth proportional to 3,909.64, 5,864.30 and 1,312.50 is: 1,968.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.64 : 5,864.30 = 1,312.50 : x
  2. Step 2: Convert to fraction form
    3,909.64/5,864.30 = 1,312.50/x
  3. Step 3: Cross multiply
    3,909.64x = 5,864.30 × 1,312.50
  4. Step 4: Simplify right side
    3,909.64x = 7,696,893.75
  5. Step 5: Solve for x
    x = 7,696,893.75/3,909.64
  6. Step 6: Final answer
    x = 1,968.70

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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.