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Finding the Fourth Proportional to 875.73, 1,312.36 and 485.91

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Solution

The fourth proportional to 875.73, 1,312.36 and 485.91 is: 728.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.73 : 1,312.36 = 485.91 : x
  2. Step 2: Convert to fraction form
    875.73/1,312.36 = 485.91/x
  3. Step 3: Cross multiply
    875.73x = 1,312.36 × 485.91
  4. Step 4: Simplify right side
    875.73x = 637,679.86
  5. Step 5: Solve for x
    x = 637,679.86/875.73
  6. Step 6: Final answer
    x = 728.17

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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.