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Finding the Fourth Proportional to 875.95, 1,312.56 and 485.74

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Solution

The fourth proportional to 875.95, 1,312.56 and 485.74 is: 727.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.95 : 1,312.56 = 485.74 : x
  2. Step 2: Convert to fraction form
    875.95/1,312.56 = 485.74/x
  3. Step 3: Cross multiply
    875.95x = 1,312.56 × 485.74
  4. Step 4: Simplify right side
    875.95x = 637,562.89
  5. Step 5: Solve for x
    x = 637,562.89/875.95
  6. Step 6: Final answer
    x = 727.85

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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.