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Finding the Fourth Proportional to 666,719.52, 920,368.44 and 425,318.64

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Solution

The fourth proportional to 666,719.52, 920,368.44 and 425,318.64 is: 587,128.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,719.52 : 920,368.44 = 425,318.64 : x
  2. Step 2: Convert to fraction form
    666,719.52/920,368.44 = 425,318.64/x
  3. Step 3: Cross multiply
    666,719.52x = 920,368.44 × 425,318.64
  4. Step 4: Simplify right side
    666,719.52x = 391,449,853,199.72
  5. Step 5: Solve for x
    x = 391,449,853,199.72/666,719.52
  6. Step 6: Final answer
    x = 587,128.23

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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.