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Finding the Fourth Proportional to 342,364.62, 513,446.55 and 128,978.58

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Solution

The fourth proportional to 342,364.62, 513,446.55 and 128,978.58 is: 193,430.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    342,364.62 : 513,446.55 = 128,978.58 : x
  2. Step 2: Convert to fraction form
    342,364.62/513,446.55 = 128,978.58/x
  3. Step 3: Cross multiply
    342,364.62x = 513,446.55 × 128,978.58
  4. Step 4: Simplify right side
    342,364.62x = 66,223,606,566.77
  5. Step 5: Solve for x
    x = 66,223,606,566.77/342,364.62
  6. Step 6: Final answer
    x = 193,430.05

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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.