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Finding the Fourth Proportional to 680,948.67, 939,427.14 and 405,251.40

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Solution

The fourth proportional to 680,948.67, 939,427.14 and 405,251.40 is: 559,079.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,948.67 : 939,427.14 = 405,251.40 : x
  2. Step 2: Convert to fraction form
    680,948.67/939,427.14 = 405,251.40/x
  3. Step 3: Cross multiply
    680,948.67x = 939,427.14 × 405,251.40
  4. Step 4: Simplify right side
    680,948.67x = 380,704,163,683.00
  5. Step 5: Solve for x
    x = 380,704,163,683.00/680,948.67
  6. Step 6: Final answer
    x = 559,079.09

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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.