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Finding the Fourth Proportional to 210,009.30, 315,013.95 and 121,435.80

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Solution

The fourth proportional to 210,009.30, 315,013.95 and 121,435.80 is: 182,153.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,009.30 : 315,013.95 = 121,435.80 : x
  2. Step 2: Convert to fraction form
    210,009.30/315,013.95 = 121,435.80/x
  3. Step 3: Cross multiply
    210,009.30x = 315,013.95 × 121,435.80
  4. Step 4: Simplify right side
    210,009.30x = 38,253,971,029.41
  5. Step 5: Solve for x
    x = 38,253,971,029.41/210,009.30
  6. Step 6: Final answer
    x = 182,153.70

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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.