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Finding the Fourth Proportional to 900.69, 1,242.93 and 507.71

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Solution

The fourth proportional to 900.69, 1,242.93 and 507.71 is: 700.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.69 : 1,242.93 = 507.71 : x
  2. Step 2: Convert to fraction form
    900.69/1,242.93 = 507.71/x
  3. Step 3: Cross multiply
    900.69x = 1,242.93 × 507.71
  4. Step 4: Simplify right side
    900.69x = 631,047.99
  5. Step 5: Solve for x
    x = 631,047.99/900.69
  6. Step 6: Final answer
    x = 700.63

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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.