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Finding the Fourth Proportional to 1,113.37, 1,534.98 and 913.47

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Solution

The fourth proportional to 1,113.37, 1,534.98 and 913.47 is: 1,259.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.37 : 1,534.98 = 913.47 : x
  2. Step 2: Convert to fraction form
    1,113.37/1,534.98 = 913.47/x
  3. Step 3: Cross multiply
    1,113.37x = 1,534.98 × 913.47
  4. Step 4: Simplify right side
    1,113.37x = 1,402,158.18
  5. Step 5: Solve for x
    x = 1,402,158.18/1,113.37
  6. Step 6: Final answer
    x = 1,259.38

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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.