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Finding the Fourth Proportional to 1,036.82, 1,430.10 and 643.16

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Solution

The fourth proportional to 1,036.82, 1,430.10 and 643.16 is: 887.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.82 : 1,430.10 = 643.16 : x
  2. Step 2: Convert to fraction form
    1,036.82/1,430.10 = 643.16/x
  3. Step 3: Cross multiply
    1,036.82x = 1,430.10 × 643.16
  4. Step 4: Simplify right side
    1,036.82x = 919,775.97
  5. Step 5: Solve for x
    x = 919,775.97/1,036.82
  6. Step 6: Final answer
    x = 887.12

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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.