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Finding the Fourth Proportional to 78,143.72, 107,751.51 and 56,590.83

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Solution

The fourth proportional to 78,143.72, 107,751.51 and 56,590.83 is: 78,032.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,143.72 : 107,751.51 = 56,590.83 : x
  2. Step 2: Convert to fraction form
    78,143.72/107,751.51 = 56,590.83/x
  3. Step 3: Cross multiply
    78,143.72x = 107,751.51 × 56,590.83
  4. Step 4: Simplify right side
    78,143.72x = 6,097,747,384.65
  5. Step 5: Solve for x
    x = 6,097,747,384.65/78,143.72
  6. Step 6: Final answer
    x = 78,032.47

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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.