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Finding the Fourth Proportional to 718.34, 990.63 and 508.55

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Solution

The fourth proportional to 718.34, 990.63 and 508.55 is: 701.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.34 : 990.63 = 508.55 : x
  2. Step 2: Convert to fraction form
    718.34/990.63 = 508.55/x
  3. Step 3: Cross multiply
    718.34x = 990.63 × 508.55
  4. Step 4: Simplify right side
    718.34x = 503,779.93
  5. Step 5: Solve for x
    x = 503,779.93/718.34
  6. Step 6: Final answer
    x = 701.32

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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.