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Finding the Fourth Proportional to 145,305.72, 217,552.57 and 78,506.51

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Solution

The fourth proportional to 145,305.72, 217,552.57 and 78,506.51 is: 117,540.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,305.72 : 217,552.57 = 78,506.51 : x
  2. Step 2: Convert to fraction form
    145,305.72/217,552.57 = 78,506.51/x
  3. Step 3: Cross multiply
    145,305.72x = 217,552.57 × 78,506.51
  4. Step 4: Simplify right side
    145,305.72x = 17,079,291,728.20
  5. Step 5: Solve for x
    x = 17,079,291,728.20/145,305.72
  6. Step 6: Final answer
    x = 117,540.40

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1.5x scale

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.