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Finding the Fourth Proportional to 621.48, 856.76 and 605.08

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Solution

The fourth proportional to 621.48, 856.76 and 605.08 is: 834.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.48 : 856.76 = 605.08 : x
  2. Step 2: Convert to fraction form
    621.48/856.76 = 605.08/x
  3. Step 3: Cross multiply
    621.48x = 856.76 × 605.08
  4. Step 4: Simplify right side
    621.48x = 518,408.34
  5. Step 5: Solve for x
    x = 518,408.34/621.48
  6. Step 6: Final answer
    x = 834.15

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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.