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Finding the Fourth Proportional to 42,750.84, 64,160.82 and 21,980.28

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Solution

The fourth proportional to 42,750.84, 64,160.82 and 21,980.28 is: 32,988.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,750.84 : 64,160.82 = 21,980.28 : x
  2. Step 2: Convert to fraction form
    42,750.84/64,160.82 = 21,980.28/x
  3. Step 3: Cross multiply
    42,750.84x = 64,160.82 × 21,980.28
  4. Step 4: Simplify right side
    42,750.84x = 1,410,272,788.63
  5. Step 5: Solve for x
    x = 1,410,272,788.63/42,750.84
  6. Step 6: Final answer
    x = 32,988.19

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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.