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Finding the Fourth Proportional to 621.60, 856.68 and 603.84

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Solution

The fourth proportional to 621.60, 856.68 and 603.84 is: 832.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.60 : 856.68 = 603.84 : x
  2. Step 2: Convert to fraction form
    621.60/856.68 = 603.84/x
  3. Step 3: Cross multiply
    621.60x = 856.68 × 603.84
  4. Step 4: Simplify right side
    621.60x = 517,297.65
  5. Step 5: Solve for x
    x = 517,297.65/621.60
  6. Step 6: Final answer
    x = 832.20

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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.