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Finding the Fourth Proportional to 784.76, 1,080.51 and 666.49

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Solution

The fourth proportional to 784.76, 1,080.51 and 666.49 is: 917.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.76 : 1,080.51 = 666.49 : x
  2. Step 2: Convert to fraction form
    784.76/1,080.51 = 666.49/x
  3. Step 3: Cross multiply
    784.76x = 1,080.51 × 666.49
  4. Step 4: Simplify right side
    784.76x = 720,153.08
  5. Step 5: Solve for x
    x = 720,153.08/784.76
  6. Step 6: Final answer
    x = 917.67

Related Problems

Find fourth proportional to 392.38, 540.26 and 333.25
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Double scale
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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.