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Finding the Fourth Proportional to 869,706.80, 1,215,101.20 and 869,706.80

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Solution

The fourth proportional to 869,706.80, 1,215,101.20 and 869,706.80 is: 1,215,101.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    869,706.80 : 1,215,101.20 = 869,706.80 : x
  2. Step 2: Convert to fraction form
    869,706.80/1,215,101.20 = 869,706.80/x
  3. Step 3: Cross multiply
    869,706.80x = 1,215,101.20 × 869,706.80
  4. Step 4: Simplify right side
    869,706.80x = 1,056,781,776,328.16
  5. Step 5: Solve for x
    x = 1,056,781,776,328.16/869,706.80
  6. Step 6: Final answer
    x = 1,215,101.20

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Double scale
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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.