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Finding the Fourth Proportional to 145,307.72, 217,555.56 and 78,508.51

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Solution

The fourth proportional to 145,307.72, 217,555.56 and 78,508.51 is: 117,543.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,307.72 : 217,555.56 = 78,508.51 : x
  2. Step 2: Convert to fraction form
    145,307.72/217,555.56 = 78,508.51/x
  3. Step 3: Cross multiply
    145,307.72x = 217,555.56 × 78,508.51
  4. Step 4: Simplify right side
    145,307.72x = 17,079,962,857.82
  5. Step 5: Solve for x
    x = 17,079,962,857.82/145,307.72
  6. Step 6: Final answer
    x = 117,543.40

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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.