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Finding the Fourth Proportional to 630.93, 870.98 and 421.45

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Solution

The fourth proportional to 630.93, 870.98 and 421.45 is: 581.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.93 : 870.98 = 421.45 : x
  2. Step 2: Convert to fraction form
    630.93/870.98 = 421.45/x
  3. Step 3: Cross multiply
    630.93x = 870.98 × 421.45
  4. Step 4: Simplify right side
    630.93x = 367,074.52
  5. Step 5: Solve for x
    x = 367,074.52/630.93
  6. Step 6: Final answer
    x = 581.80

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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.