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Finding the Fourth Proportional to 953.61, 1,430.70 and 405.78

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Solution

The fourth proportional to 953.61, 1,430.70 and 405.78 is: 608.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.61 : 1,430.70 = 405.78 : x
  2. Step 2: Convert to fraction form
    953.61/1,430.70 = 405.78/x
  3. Step 3: Cross multiply
    953.61x = 1,430.70 × 405.78
  4. Step 4: Simplify right side
    953.61x = 580,549.45
  5. Step 5: Solve for x
    x = 580,549.45/953.61
  6. Step 6: Final answer
    x = 608.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.