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Finding the Fourth Proportional to 210,191.76, 315,307.20 and 83,801.40

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Solution

The fourth proportional to 210,191.76, 315,307.20 and 83,801.40 is: 125,709.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,191.76 : 315,307.20 = 83,801.40 : x
  2. Step 2: Convert to fraction form
    210,191.76/315,307.20 = 83,801.40/x
  3. Step 3: Cross multiply
    210,191.76x = 315,307.20 × 83,801.40
  4. Step 4: Simplify right side
    210,191.76x = 26,423,184,790.08
  5. Step 5: Solve for x
    x = 26,423,184,790.08/210,191.76
  6. Step 6: Final answer
    x = 125,709.90

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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.