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Finding the Fourth Proportional to 953.06, 1,315.14 and 621.56

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Solution

The fourth proportional to 953.06, 1,315.14 and 621.56 is: 857.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.06 : 1,315.14 = 621.56 : x
  2. Step 2: Convert to fraction form
    953.06/1,315.14 = 621.56/x
  3. Step 3: Cross multiply
    953.06x = 1,315.14 × 621.56
  4. Step 4: Simplify right side
    953.06x = 817,431.84
  5. Step 5: Solve for x
    x = 817,431.84/953.06
  6. Step 6: Final answer
    x = 857.70

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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.