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Finding the Fourth Proportional to 8,703.76, 12,011.20 and 4,977.76

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Solution

The fourth proportional to 8,703.76, 12,011.20 and 4,977.76 is: 6,869.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,703.76 : 12,011.20 = 4,977.76 : x
  2. Step 2: Convert to fraction form
    8,703.76/12,011.20 = 4,977.76/x
  3. Step 3: Cross multiply
    8,703.76x = 12,011.20 × 4,977.76
  4. Step 4: Simplify right side
    8,703.76x = 59,788,870.91
  5. Step 5: Solve for x
    x = 59,788,870.91/8,703.76
  6. Step 6: Final answer
    x = 6,869.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.