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Finding the Third Proportional to 21,875 and 28,985.50

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Solution

The third proportional to 21,875 and 28,985.50 is: 38,407.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,875 : 28,985.50 = 28,985.50 : x
  2. Step 2: Convert to fraction form
    21,875/28,985.50 = 28,985.50/x
  3. Step 3: Cross multiply
    21,875x = 28,985.50 × 28,985.50
  4. Step 4: Simplify right side
    21,875x = 840,159,210.25
  5. Step 5: Solve for x
    x = 840,159,210.25/21,875
  6. Step 6: Final answer
    x = 38,407.28

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.