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Finding the Fourth Proportional to 900.64, 1,243.01 and 507.70

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Solution

The fourth proportional to 900.64, 1,243.01 and 507.70 is: 700.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.64 : 1,243.01 = 507.70 : x
  2. Step 2: Convert to fraction form
    900.64/1,243.01 = 507.70/x
  3. Step 3: Cross multiply
    900.64x = 1,243.01 × 507.70
  4. Step 4: Simplify right side
    900.64x = 631,076.18
  5. Step 5: Solve for x
    x = 631,076.18/900.64
  6. Step 6: Final answer
    x = 700.70

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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.