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Finding the Fourth Proportional to 874,660.80, 1,312,064.16 and 640,912.32

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Solution

The fourth proportional to 874,660.80, 1,312,064.16 and 640,912.32 is: 961,421.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    874,660.80 : 1,312,064.16 = 640,912.32 : x
  2. Step 2: Convert to fraction form
    874,660.80/1,312,064.16 = 640,912.32/x
  3. Step 3: Cross multiply
    874,660.80x = 1,312,064.16 × 640,912.32
  4. Step 4: Simplify right side
    874,660.80x = 840,918,084,774.45
  5. Step 5: Solve for x
    x = 840,918,084,774.45/874,660.80
  6. Step 6: Final answer
    x = 961,421.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.