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Finding the Fourth Proportional to 52,457.40, 78,690.90 and 21,286.20

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Solution

The fourth proportional to 52,457.40, 78,690.90 and 21,286.20 is: 31,931.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,457.40 : 78,690.90 = 21,286.20 : x
  2. Step 2: Convert to fraction form
    52,457.40/78,690.90 = 21,286.20/x
  3. Step 3: Cross multiply
    52,457.40x = 78,690.90 × 21,286.20
  4. Step 4: Simplify right side
    52,457.40x = 1,675,030,235.58
  5. Step 5: Solve for x
    x = 1,675,030,235.58/52,457.40
  6. Step 6: Final answer
    x = 31,931.25

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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.