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Finding the Fourth Proportional to 1,006.76, 1,388.70 and 647.70

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Solution

The fourth proportional to 1,006.76, 1,388.70 and 647.70 is: 893.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.76 : 1,388.70 = 647.70 : x
  2. Step 2: Convert to fraction form
    1,006.76/1,388.70 = 647.70/x
  3. Step 3: Cross multiply
    1,006.76x = 1,388.70 × 647.70
  4. Step 4: Simplify right side
    1,006.76x = 899,466.08
  5. Step 5: Solve for x
    x = 899,466.08/1,006.76
  6. Step 6: Final answer
    x = 893.43

Related Problems

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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.