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Finding the Fourth Proportional to 1,038.68, 1,430.16 and 890.72

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Solution

The fourth proportional to 1,038.68, 1,430.16 and 890.72 is: 1,226.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.68 : 1,430.16 = 890.72 : x
  2. Step 2: Convert to fraction form
    1,038.68/1,430.16 = 890.72/x
  3. Step 3: Cross multiply
    1,038.68x = 1,430.16 × 890.72
  4. Step 4: Simplify right side
    1,038.68x = 1,273,872.12
  5. Step 5: Solve for x
    x = 1,273,872.12/1,038.68
  6. Step 6: Final answer
    x = 1,226.43

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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.