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Finding the Fourth Proportional to 153,970.21, 212,682.89 and 123,868.90

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Solution

The fourth proportional to 153,970.21, 212,682.89 and 123,868.90 is: 171,103.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,970.21 : 212,682.89 = 123,868.90 : x
  2. Step 2: Convert to fraction form
    153,970.21/212,682.89 = 123,868.90/x
  3. Step 3: Cross multiply
    153,970.21x = 212,682.89 × 123,868.90
  4. Step 4: Simplify right side
    153,970.21x = 26,344,793,950.36
  5. Step 5: Solve for x
    x = 26,344,793,950.36/153,970.21
  6. Step 6: Final answer
    x = 171,103.19

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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.