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Finding the Fourth Proportional to 1,039.98, 1,434.74 and 666.89

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Solution

The fourth proportional to 1,039.98, 1,434.74 and 666.89 is: 920.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.98 : 1,434.74 = 666.89 : x
  2. Step 2: Convert to fraction form
    1,039.98/1,434.74 = 666.89/x
  3. Step 3: Cross multiply
    1,039.98x = 1,434.74 × 666.89
  4. Step 4: Simplify right side
    1,039.98x = 956,803.25
  5. Step 5: Solve for x
    x = 956,803.25/1,039.98
  6. Step 6: Final answer
    x = 920.02

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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.