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Finding the Fourth Proportional to 1,006.58, 1,389.10 and 657.06

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Solution

The fourth proportional to 1,006.58, 1,389.10 and 657.06 is: 906.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.58 : 1,389.10 = 657.06 : x
  2. Step 2: Convert to fraction form
    1,006.58/1,389.10 = 657.06/x
  3. Step 3: Cross multiply
    1,006.58x = 1,389.10 × 657.06
  4. Step 4: Simplify right side
    1,006.58x = 912,722.05
  5. Step 5: Solve for x
    x = 912,722.05/1,006.58
  6. Step 6: Final answer
    x = 906.76

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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.