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Finding the Fourth Proportional to 287,718.20, 402,280.60 and 287,718.20

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Solution

The fourth proportional to 287,718.20, 402,280.60 and 287,718.20 is: 402,280.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,718.20 : 402,280.60 = 287,718.20 : x
  2. Step 2: Convert to fraction form
    287,718.20/402,280.60 = 287,718.20/x
  3. Step 3: Cross multiply
    287,718.20x = 402,280.60 × 287,718.20
  4. Step 4: Simplify right side
    287,718.20x = 115,743,450,126.92
  5. Step 5: Solve for x
    x = 115,743,450,126.92/287,718.20
  6. Step 6: Final answer
    x = 402,280.60

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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.