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Finding the Fourth Proportional to 28,988.80, 43,483.20 and 21,990.40

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Solution

The fourth proportional to 28,988.80, 43,483.20 and 21,990.40 is: 32,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,988.80 : 43,483.20 = 21,990.40 : x
  2. Step 2: Convert to fraction form
    28,988.80/43,483.20 = 21,990.40/x
  3. Step 3: Cross multiply
    28,988.80x = 43,483.20 × 21,990.40
  4. Step 4: Simplify right side
    28,988.80x = 956,212,961.28
  5. Step 5: Solve for x
    x = 956,212,961.28/28,988.80
  6. Step 6: Final answer
    x = 32,985.60

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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.