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Finding the Fourth Proportional to 899.86, 1,240.08 and 775.48

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Solution

The fourth proportional to 899.86, 1,240.08 and 775.48 is: 1,068.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.86 : 1,240.08 = 775.48 : x
  2. Step 2: Convert to fraction form
    899.86/1,240.08 = 775.48/x
  3. Step 3: Cross multiply
    899.86x = 1,240.08 × 775.48
  4. Step 4: Simplify right side
    899.86x = 961,657.24
  5. Step 5: Solve for x
    x = 961,657.24/899.86
  6. Step 6: Final answer
    x = 1,068.67

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1.5x scale

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.