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Finding the Fourth Proportional to 210,009.10, 315,013.65 and 91,911.10

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Solution

The fourth proportional to 210,009.10, 315,013.65 and 91,911.10 is: 137,866.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,009.10 : 315,013.65 = 91,911.10 : x
  2. Step 2: Convert to fraction form
    210,009.10/315,013.65 = 91,911.10/x
  3. Step 3: Cross multiply
    210,009.10x = 315,013.65 × 91,911.10
  4. Step 4: Simplify right side
    210,009.10x = 28,953,251,086.52
  5. Step 5: Solve for x
    x = 28,953,251,086.52/210,009.10
  6. Step 6: Final answer
    x = 137,866.65

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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.