Home / 31,780.84-47,678.10-10,721.40

Finding the Fourth Proportional to 31,780.84, 47,678.10 and 10,721.40

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Solution

The fourth proportional to 31,780.84, 47,678.10 and 10,721.40 is: 16,084.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,780.84 : 47,678.10 = 10,721.40 : x
  2. Step 2: Convert to fraction form
    31,780.84/47,678.10 = 10,721.40/x
  3. Step 3: Cross multiply
    31,780.84x = 47,678.10 × 10,721.40
  4. Step 4: Simplify right side
    31,780.84x = 511,175,981.34
  5. Step 5: Solve for x
    x = 511,175,981.34/31,780.84
  6. Step 6: Final answer
    x = 16,084.41

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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.