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Finding the Fourth Proportional to 602.19, 830.72 and 405.36

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Solution

The fourth proportional to 602.19, 830.72 and 405.36 is: 559.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.19 : 830.72 = 405.36 : x
  2. Step 2: Convert to fraction form
    602.19/830.72 = 405.36/x
  3. Step 3: Cross multiply
    602.19x = 830.72 × 405.36
  4. Step 4: Simplify right side
    602.19x = 336,741.67
  5. Step 5: Solve for x
    x = 336,741.67/602.19
  6. Step 6: Final answer
    x = 559.20

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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.