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Finding the Fourth Proportional to 153,123.40, 211,310.48 and 85,139.64

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Solution

The fourth proportional to 153,123.40, 211,310.48 and 85,139.64 is: 117,492.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,123.40 : 211,310.48 = 85,139.64 : x
  2. Step 2: Convert to fraction form
    153,123.40/211,310.48 = 85,139.64/x
  3. Step 3: Cross multiply
    153,123.40x = 211,310.48 × 85,139.64
  4. Step 4: Simplify right side
    153,123.40x = 17,990,898,408.28
  5. Step 5: Solve for x
    x = 17,990,898,408.28/153,123.40
  6. Step 6: Final answer
    x = 117,492.81

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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.