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Finding the Fourth Proportional to 1,006.60, 1,389.54 and 657.76

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Solution

The fourth proportional to 1,006.60, 1,389.54 and 657.76 is: 907.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.60 : 1,389.54 = 657.76 : x
  2. Step 2: Convert to fraction form
    1,006.60/1,389.54 = 657.76/x
  3. Step 3: Cross multiply
    1,006.60x = 1,389.54 × 657.76
  4. Step 4: Simplify right side
    1,006.60x = 913,983.83
  5. Step 5: Solve for x
    x = 913,983.83/1,006.60
  6. Step 6: Final answer
    x = 907.99

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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.