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Finding the Fourth Proportional to 962.93, 1,328.60 and 647.63

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Solution

The fourth proportional to 962.93, 1,328.60 and 647.63 is: 893.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    962.93 : 1,328.60 = 647.63 : x
  2. Step 2: Convert to fraction form
    962.93/1,328.60 = 647.63/x
  3. Step 3: Cross multiply
    962.93x = 1,328.60 × 647.63
  4. Step 4: Simplify right side
    962.93x = 860,431.34
  5. Step 5: Solve for x
    x = 860,431.34/962.93
  6. Step 6: Final answer
    x = 893.56

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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.