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Finding the Fourth Proportional to 212,807.55, 318,648.15 and 128,454.96

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Solution

The fourth proportional to 212,807.55, 318,648.15 and 128,454.96 is: 192,342.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,807.55 : 318,648.15 = 128,454.96 : x
  2. Step 2: Convert to fraction form
    212,807.55/318,648.15 = 128,454.96/x
  3. Step 3: Cross multiply
    212,807.55x = 318,648.15 × 128,454.96
  4. Step 4: Simplify right side
    212,807.55x = 40,931,935,362.32
  5. Step 5: Solve for x
    x = 40,931,935,362.32/212,807.55
  6. Step 6: Final answer
    x = 192,342.50

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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.