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Finding the Fourth Proportional to 455,998.40, 639,972.40 and 455,998.40

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Solution

The fourth proportional to 455,998.40, 639,972.40 and 455,998.40 is: 639,972.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,998.40 : 639,972.40 = 455,998.40 : x
  2. Step 2: Convert to fraction form
    455,998.40/639,972.40 = 455,998.40/x
  3. Step 3: Cross multiply
    455,998.40x = 639,972.40 × 455,998.40
  4. Step 4: Simplify right side
    455,998.40x = 291,826,390,444.16
  5. Step 5: Solve for x
    x = 291,826,390,444.16/455,998.40
  6. Step 6: Final answer
    x = 639,972.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.