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Finding the Fourth Proportional to 578,639.40, 811,961.40 and 578,639.40

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Solution

The fourth proportional to 578,639.40, 811,961.40 and 578,639.40 is: 811,961.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,639.40 : 811,961.40 = 578,639.40 : x
  2. Step 2: Convert to fraction form
    578,639.40/811,961.40 = 578,639.40/x
  3. Step 3: Cross multiply
    578,639.40x = 811,961.40 × 578,639.40
  4. Step 4: Simplify right side
    578,639.40x = 469,832,857,319.16
  5. Step 5: Solve for x
    x = 469,832,857,319.16/578,639.40
  6. Step 6: Final answer
    x = 811,961.40

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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.