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Finding the Fourth Proportional to 989.65, 1,482.57 and 555.49

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Solution

The fourth proportional to 989.65, 1,482.57 and 555.49 is: 832.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.65 : 1,482.57 = 555.49 : x
  2. Step 2: Convert to fraction form
    989.65/1,482.57 = 555.49/x
  3. Step 3: Cross multiply
    989.65x = 1,482.57 × 555.49
  4. Step 4: Simplify right side
    989.65x = 823,552.81
  5. Step 5: Solve for x
    x = 823,552.81/989.65
  6. Step 6: Final answer
    x = 832.17

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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.