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Finding the Fourth Proportional to 1,011.45, 1,395.62 and 638.94

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Solution

The fourth proportional to 1,011.45, 1,395.62 and 638.94 is: 881.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.45 : 1,395.62 = 638.94 : x
  2. Step 2: Convert to fraction form
    1,011.45/1,395.62 = 638.94/x
  3. Step 3: Cross multiply
    1,011.45x = 1,395.62 × 638.94
  4. Step 4: Simplify right side
    1,011.45x = 891,714.25
  5. Step 5: Solve for x
    x = 891,714.25/1,011.45
  6. Step 6: Final answer
    x = 881.62

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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.