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Finding the Fourth Proportional to 212,617.20, 318,925.80 and 123,970.80

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Solution

The fourth proportional to 212,617.20, 318,925.80 and 123,970.80 is: 185,956.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,617.20 : 318,925.80 = 123,970.80 : x
  2. Step 2: Convert to fraction form
    212,617.20/318,925.80 = 123,970.80/x
  3. Step 3: Cross multiply
    212,617.20x = 318,925.80 × 123,970.80
  4. Step 4: Simplify right side
    212,617.20x = 39,537,486,566.64
  5. Step 5: Solve for x
    x = 39,537,486,566.64/212,617.20
  6. Step 6: Final answer
    x = 185,956.20

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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.