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Finding the Fourth Proportional to 1,345.99, 2,018.73 and 615.40

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Solution

The fourth proportional to 1,345.99, 2,018.73 and 615.40 is: 922.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.99 : 2,018.73 = 615.40 : x
  2. Step 2: Convert to fraction form
    1,345.99/2,018.73 = 615.40/x
  3. Step 3: Cross multiply
    1,345.99x = 2,018.73 × 615.40
  4. Step 4: Simplify right side
    1,345.99x = 1,242,326.44
  5. Step 5: Solve for x
    x = 1,242,326.44/1,345.99
  6. Step 6: Final answer
    x = 922.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.