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Finding the Fourth Proportional to 978,221.70, 1,371,998.70 and 978,221.70

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Solution

The fourth proportional to 978,221.70, 1,371,998.70 and 978,221.70 is: 1,371,998.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,221.70 : 1,371,998.70 = 978,221.70 : x
  2. Step 2: Convert to fraction form
    978,221.70/1,371,998.70 = 978,221.70/x
  3. Step 3: Cross multiply
    978,221.70x = 1,371,998.70 × 978,221.70
  4. Step 4: Simplify right side
    978,221.70x = 1,342,118,900,711.79
  5. Step 5: Solve for x
    x = 1,342,118,900,711.79/978,221.70
  6. Step 6: Final answer
    x = 1,371,998.70

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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.