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Finding the Fourth Proportional to 887,688, 1,225,013.76 and 485,280

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Solution

The fourth proportional to 887,688, 1,225,013.76 and 485,280 is: 669,688.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    887,688 : 1,225,013.76 = 485,280 : x
  2. Step 2: Convert to fraction form
    887,688/1,225,013.76 = 485,280/x
  3. Step 3: Cross multiply
    887,688x = 1,225,013.76 × 485,280
  4. Step 4: Simplify right side
    887,688x = 594,474,677,452.80
  5. Step 5: Solve for x
    x = 594,474,677,452.80/887,688
  6. Step 6: Final answer
    x = 669,688.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.