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Finding the Fourth Proportional to 988.95, 1,482.21 and 555.20

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Solution

The fourth proportional to 988.95, 1,482.21 and 555.20 is: 832.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.95 : 1,482.21 = 555.20 : x
  2. Step 2: Convert to fraction form
    988.95/1,482.21 = 555.20/x
  3. Step 3: Cross multiply
    988.95x = 1,482.21 × 555.20
  4. Step 4: Simplify right side
    988.95x = 822,915.58
  5. Step 5: Solve for x
    x = 822,915.58/988.95
  6. Step 6: Final answer
    x = 832.11

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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.