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Finding the Fourth Proportional to 8,421.79, 12,616.53 and 4,712.79

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Solution

The fourth proportional to 8,421.79, 12,616.53 and 4,712.79 is: 7,060.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.79 : 12,616.53 = 4,712.79 : x
  2. Step 2: Convert to fraction form
    8,421.79/12,616.53 = 4,712.79/x
  3. Step 3: Cross multiply
    8,421.79x = 12,616.53 × 4,712.79
  4. Step 4: Simplify right side
    8,421.79x = 59,459,056.42
  5. Step 5: Solve for x
    x = 59,459,056.42/8,421.79
  6. Step 6: Final answer
    x = 7,060.14

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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.