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Finding the Fourth Proportional to 1,007.05, 1,509.96 and 921.11

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Solution

The fourth proportional to 1,007.05, 1,509.96 and 921.11 is: 1,381.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.05 : 1,509.96 = 921.11 : x
  2. Step 2: Convert to fraction form
    1,007.05/1,509.96 = 921.11/x
  3. Step 3: Cross multiply
    1,007.05x = 1,509.96 × 921.11
  4. Step 4: Simplify right side
    1,007.05x = 1,390,841.56
  5. Step 5: Solve for x
    x = 1,390,841.56/1,007.05
  6. Step 6: Final answer
    x = 1,381.10

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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.