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Finding the Fourth Proportional to 4,920.76, 6,790.06 and 2,931.40

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Solution

The fourth proportional to 4,920.76, 6,790.06 and 2,931.40 is: 4,044.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,920.76 : 6,790.06 = 2,931.40 : x
  2. Step 2: Convert to fraction form
    4,920.76/6,790.06 = 2,931.40/x
  3. Step 3: Cross multiply
    4,920.76x = 6,790.06 × 2,931.40
  4. Step 4: Simplify right side
    4,920.76x = 19,904,381.88
  5. Step 5: Solve for x
    x = 19,904,381.88/4,920.76
  6. Step 6: Final answer
    x = 4,044.98

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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.