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Finding the Fourth Proportional to 2,117.70, 2,969.10 and 2,117.70

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Solution

The fourth proportional to 2,117.70, 2,969.10 and 2,117.70 is: 2,969.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.70 : 2,969.10 = 2,117.70 : x
  2. Step 2: Convert to fraction form
    2,117.70/2,969.10 = 2,117.70/x
  3. Step 3: Cross multiply
    2,117.70x = 2,969.10 × 2,117.70
  4. Step 4: Simplify right side
    2,117.70x = 6,287,663.07
  5. Step 5: Solve for x
    x = 6,287,663.07/2,117.70
  6. Step 6: Final answer
    x = 2,969.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.