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Finding the Fourth Proportional to 666,781.58, 920,149.26 and 380,306.36

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Solution

The fourth proportional to 666,781.58, 920,149.26 and 380,306.36 is: 524,817.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,781.58 : 920,149.26 = 380,306.36 : x
  2. Step 2: Convert to fraction form
    666,781.58/920,149.26 = 380,306.36/x
  3. Step 3: Cross multiply
    666,781.58x = 920,149.26 × 380,306.36
  4. Step 4: Simplify right side
    666,781.58x = 349,938,615,727.29
  5. Step 5: Solve for x
    x = 349,938,615,727.29/666,781.58
  6. Step 6: Final answer
    x = 524,817.46

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1.5x scale

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.