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Finding the Fourth Proportional to 56,919.60, 85,307.40 and 21,812.40

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Solution

The fourth proportional to 56,919.60, 85,307.40 and 21,812.40 is: 32,691.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,919.60 : 85,307.40 = 21,812.40 : x
  2. Step 2: Convert to fraction form
    56,919.60/85,307.40 = 21,812.40/x
  3. Step 3: Cross multiply
    56,919.60x = 85,307.40 × 21,812.40
  4. Step 4: Simplify right side
    56,919.60x = 1,860,759,131.76
  5. Step 5: Solve for x
    x = 1,860,759,131.76/56,919.60
  6. Step 6: Final answer
    x = 32,691.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.