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Finding the Fourth Proportional to 670.12, 924.72 and 421.28

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Solution

The fourth proportional to 670.12, 924.72 and 421.28 is: 581.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.12 : 924.72 = 421.28 : x
  2. Step 2: Convert to fraction form
    670.12/924.72 = 421.28/x
  3. Step 3: Cross multiply
    670.12x = 924.72 × 421.28
  4. Step 4: Simplify right side
    670.12x = 389,566.04
  5. Step 5: Solve for x
    x = 389,566.04/670.12
  6. Step 6: Final answer
    x = 581.34

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Double scale
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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.