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Finding the Fourth Proportional to 1,037.20, 1,430.58 and 663.88

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Solution

The fourth proportional to 1,037.20, 1,430.58 and 663.88 is: 915.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,037.20 : 1,430.58 = 663.88 : x
  2. Step 2: Convert to fraction form
    1,037.20/1,430.58 = 663.88/x
  3. Step 3: Cross multiply
    1,037.20x = 1,430.58 × 663.88
  4. Step 4: Simplify right side
    1,037.20x = 949,733.45
  5. Step 5: Solve for x
    x = 949,733.45/1,037.20
  6. Step 6: Final answer
    x = 915.67

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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.