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Finding the Fourth Proportional to 689,921, 952,090.74 and 388,115

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Solution

The fourth proportional to 689,921, 952,090.74 and 388,115 is: 535,598.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,921 : 952,090.74 = 388,115 : x
  2. Step 2: Convert to fraction form
    689,921/952,090.74 = 388,115/x
  3. Step 3: Cross multiply
    689,921x = 952,090.74 × 388,115
  4. Step 4: Simplify right side
    689,921x = 369,520,697,555.10
  5. Step 5: Solve for x
    x = 369,520,697,555.10/689,921
  6. Step 6: Final answer
    x = 535,598.56

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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.