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Finding the Fourth Proportional to 1,520, 2,097.72 and 847.90

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Solution

The fourth proportional to 1,520, 2,097.72 and 847.90 is: 1,170.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520 : 2,097.72 = 847.90 : x
  2. Step 2: Convert to fraction form
    1,520/2,097.72 = 847.90/x
  3. Step 3: Cross multiply
    1,520x = 2,097.72 × 847.90
  4. Step 4: Simplify right side
    1,520x = 1,778,656.79
  5. Step 5: Solve for x
    x = 1,778,656.79/1,520
  6. Step 6: Final answer
    x = 1,170.17

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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.