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Finding the Fourth Proportional to 885.72, 1,221.96 and 536.40

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Solution

The fourth proportional to 885.72, 1,221.96 and 536.40 is: 740.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.72 : 1,221.96 = 536.40 : x
  2. Step 2: Convert to fraction form
    885.72/1,221.96 = 536.40/x
  3. Step 3: Cross multiply
    885.72x = 1,221.96 × 536.40
  4. Step 4: Simplify right side
    885.72x = 655,459.34
  5. Step 5: Solve for x
    x = 655,459.34/885.72
  6. Step 6: Final answer
    x = 740.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.