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Finding the Fourth Proportional to 878,415.20, 1,317,817.20 and 404,986.40

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Solution

The fourth proportional to 878,415.20, 1,317,817.20 and 404,986.40 is: 607,569.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,415.20 : 1,317,817.20 = 404,986.40 : x
  2. Step 2: Convert to fraction form
    878,415.20/1,317,817.20 = 404,986.40/x
  3. Step 3: Cross multiply
    878,415.20x = 1,317,817.20 × 404,986.40
  4. Step 4: Simplify right side
    878,415.20x = 533,698,043,686.08
  5. Step 5: Solve for x
    x = 533,698,043,686.08/878,415.20
  6. Step 6: Final answer
    x = 607,569.23

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1.5x scale

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.