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Finding the Fourth Proportional to 287,721.70, 402,285.50 and 287,721.70

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Solution

The fourth proportional to 287,721.70, 402,285.50 and 287,721.70 is: 402,285.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,721.70 : 402,285.50 = 287,721.70 : x
  2. Step 2: Convert to fraction form
    287,721.70/402,285.50 = 287,721.70/x
  3. Step 3: Cross multiply
    287,721.70x = 402,285.50 × 287,721.70
  4. Step 4: Simplify right side
    287,721.70x = 115,746,267,945.35
  5. Step 5: Solve for x
    x = 115,746,267,945.35/287,721.70
  6. Step 6: Final answer
    x = 402,285.50

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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.