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Finding the Fourth Proportional to 1,055.63, 1,585.28 and 647.17

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Solution

The fourth proportional to 1,055.63, 1,585.28 and 647.17 is: 971.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.63 : 1,585.28 = 647.17 : x
  2. Step 2: Convert to fraction form
    1,055.63/1,585.28 = 647.17/x
  3. Step 3: Cross multiply
    1,055.63x = 1,585.28 × 647.17
  4. Step 4: Simplify right side
    1,055.63x = 1,025,938.46
  5. Step 5: Solve for x
    x = 1,025,938.46/1,055.63
  6. Step 6: Final answer
    x = 971.87

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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.