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Finding the Fourth Proportional to 210,170.40, 315,547.20 and 131,438.40

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Solution

The fourth proportional to 210,170.40, 315,547.20 and 131,438.40 is: 197,339.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,170.40 : 315,547.20 = 131,438.40 : x
  2. Step 2: Convert to fraction form
    210,170.40/315,547.20 = 131,438.40/x
  3. Step 3: Cross multiply
    210,170.40x = 315,547.20 × 131,438.40
  4. Step 4: Simplify right side
    210,170.40x = 41,475,019,092.48
  5. Step 5: Solve for x
    x = 41,475,019,092.48/210,170.40
  6. Step 6: Final answer
    x = 197,339.96

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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.