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Finding the Fourth Proportional to 287,738.70, 402,309.30 and 287,738.70

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Solution

The fourth proportional to 287,738.70, 402,309.30 and 287,738.70 is: 402,309.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,738.70 : 402,309.30 = 287,738.70 : x
  2. Step 2: Convert to fraction form
    287,738.70/402,309.30 = 287,738.70/x
  3. Step 3: Cross multiply
    287,738.70x = 402,309.30 × 287,738.70
  4. Step 4: Simplify right side
    287,738.70x = 115,759,954,979.91
  5. Step 5: Solve for x
    x = 115,759,954,979.91/287,738.70
  6. Step 6: Final answer
    x = 402,309.30

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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.