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Finding the Fourth Proportional to 984,321, 1,358,953.47 and 645,379.74

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Solution

The fourth proportional to 984,321, 1,358,953.47 and 645,379.74 is: 891,011.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    984,321 : 1,358,953.47 = 645,379.74 : x
  2. Step 2: Convert to fraction form
    984,321/1,358,953.47 = 645,379.74/x
  3. Step 3: Cross multiply
    984,321x = 1,358,953.47 × 645,379.74
  4. Step 4: Simplify right side
    984,321x = 877,041,037,140.70
  5. Step 5: Solve for x
    x = 877,041,037,140.70/984,321
  6. Step 6: Final answer
    x = 891,011.20

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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.