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Finding the Fourth Proportional to 869,438.80, 1,214,726 and 869,438.80

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Solution

The fourth proportional to 869,438.80, 1,214,726 and 869,438.80 is: 1,214,726

Step by Step Solution

  1. Step 1: Write the proportion equation
    869,438.80 : 1,214,726 = 869,438.80 : x
  2. Step 2: Convert to fraction form
    869,438.80/1,214,726 = 869,438.80/x
  3. Step 3: Cross multiply
    869,438.80x = 1,214,726 × 869,438.80
  4. Step 4: Simplify right side
    869,438.80x = 1,056,129,915,768.80
  5. Step 5: Solve for x
    x = 1,056,129,915,768.80/869,438.80
  6. Step 6: Final answer
    x = 1,214,726

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Double scale
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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.