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Finding the Fourth Proportional to 953.56, 1,316.13 and 621.40

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Solution

The fourth proportional to 953.56, 1,316.13 and 621.40 is: 857.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.56 : 1,316.13 = 621.40 : x
  2. Step 2: Convert to fraction form
    953.56/1,316.13 = 621.40/x
  3. Step 3: Cross multiply
    953.56x = 1,316.13 × 621.40
  4. Step 4: Simplify right side
    953.56x = 817,843.18
  5. Step 5: Solve for x
    x = 817,843.18/953.56
  6. Step 6: Final answer
    x = 857.67

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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.