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Finding the Fourth Proportional to 904.61, 1,246.98 and 707.78

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Solution

The fourth proportional to 904.61, 1,246.98 and 707.78 is: 975.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.61 : 1,246.98 = 707.78 : x
  2. Step 2: Convert to fraction form
    904.61/1,246.98 = 707.78/x
  3. Step 3: Cross multiply
    904.61x = 1,246.98 × 707.78
  4. Step 4: Simplify right side
    904.61x = 882,581.27
  5. Step 5: Solve for x
    x = 882,581.27/904.61
  6. Step 6: Final answer
    x = 975.65

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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.