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Finding the Fourth Proportional to 916.98, 1,375.48 and 430.98

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Solution

The fourth proportional to 916.98, 1,375.48 and 430.98 is: 646.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.98 : 1,375.48 = 430.98 : x
  2. Step 2: Convert to fraction form
    916.98/1,375.48 = 430.98/x
  3. Step 3: Cross multiply
    916.98x = 1,375.48 × 430.98
  4. Step 4: Simplify right side
    916.98x = 592,804.37
  5. Step 5: Solve for x
    x = 592,804.37/916.98
  6. Step 6: Final answer
    x = 646.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.