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Finding the Fourth Proportional to 153,430.55, 211,719.03 and 85,453.87

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Solution

The fourth proportional to 153,430.55, 211,719.03 and 85,453.87 is: 117,917.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,430.55 : 211,719.03 = 85,453.87 : x
  2. Step 2: Convert to fraction form
    153,430.55/211,719.03 = 85,453.87/x
  3. Step 3: Cross multiply
    153,430.55x = 211,719.03 × 85,453.87
  4. Step 4: Simplify right side
    153,430.55x = 18,092,210,466.15
  5. Step 5: Solve for x
    x = 18,092,210,466.15/153,430.55
  6. Step 6: Final answer
    x = 117,917.91

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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.