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Finding the Fourth Proportional to 21,938.40, 32,915.70 and 21,128.40

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Solution

The fourth proportional to 21,938.40, 32,915.70 and 21,128.40 is: 31,700.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,938.40 : 32,915.70 = 21,128.40 : x
  2. Step 2: Convert to fraction form
    21,938.40/32,915.70 = 21,128.40/x
  3. Step 3: Cross multiply
    21,938.40x = 32,915.70 × 21,128.40
  4. Step 4: Simplify right side
    21,938.40x = 695,456,075.88
  5. Step 5: Solve for x
    x = 695,456,075.88/21,938.40
  6. Step 6: Final answer
    x = 31,700.40

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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.