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Finding the Fourth Proportional to 875.62, 1,312.98 and 511.12

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Solution

The fourth proportional to 875.62, 1,312.98 and 511.12 is: 766.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.62 : 1,312.98 = 511.12 : x
  2. Step 2: Convert to fraction form
    875.62/1,312.98 = 511.12/x
  3. Step 3: Cross multiply
    875.62x = 1,312.98 × 511.12
  4. Step 4: Simplify right side
    875.62x = 671,090.34
  5. Step 5: Solve for x
    x = 671,090.34/875.62
  6. Step 6: Final answer
    x = 766.42

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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.