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Finding the Fourth Proportional to 1,006.40, 1,507.80 and 891.20

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Solution

The fourth proportional to 1,006.40, 1,507.80 and 891.20 is: 1,335.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.40 : 1,507.80 = 891.20 : x
  2. Step 2: Convert to fraction form
    1,006.40/1,507.80 = 891.20/x
  3. Step 3: Cross multiply
    1,006.40x = 1,507.80 × 891.20
  4. Step 4: Simplify right side
    1,006.40x = 1,343,751.36
  5. Step 5: Solve for x
    x = 1,343,751.36/1,006.40
  6. Step 6: Final answer
    x = 1,335.21

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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.