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Finding the Fourth Proportional to 1,347.77, 1,859.95 and 816.63

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Solution

The fourth proportional to 1,347.77, 1,859.95 and 816.63 is: 1,126.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.77 : 1,859.95 = 816.63 : x
  2. Step 2: Convert to fraction form
    1,347.77/1,859.95 = 816.63/x
  3. Step 3: Cross multiply
    1,347.77x = 1,859.95 × 816.63
  4. Step 4: Simplify right side
    1,347.77x = 1,518,894.37
  5. Step 5: Solve for x
    x = 1,518,894.37/1,347.77
  6. Step 6: Final answer
    x = 1,126.97

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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.