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Finding the Fourth Proportional to 1,036.55, 1,430.70 and 643.35

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Solution

The fourth proportional to 1,036.55, 1,430.70 and 643.35 is: 887.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.55 : 1,430.70 = 643.35 : x
  2. Step 2: Convert to fraction form
    1,036.55/1,430.70 = 643.35/x
  3. Step 3: Cross multiply
    1,036.55x = 1,430.70 × 643.35
  4. Step 4: Simplify right side
    1,036.55x = 920,440.85
  5. Step 5: Solve for x
    x = 920,440.85/1,036.55
  6. Step 6: Final answer
    x = 887.99

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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.