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Finding the Fourth Proportional to 885.71, 1,221.68 and 570.87

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Solution

The fourth proportional to 885.71, 1,221.68 and 570.87 is: 787.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.71 : 1,221.68 = 570.87 : x
  2. Step 2: Convert to fraction form
    885.71/1,221.68 = 570.87/x
  3. Step 3: Cross multiply
    885.71x = 1,221.68 × 570.87
  4. Step 4: Simplify right side
    885.71x = 697,421.89
  5. Step 5: Solve for x
    x = 697,421.89/885.71
  6. Step 6: Final answer
    x = 787.41

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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.