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Finding the Fourth Proportional to 717,980.86, 990,639.57 and 407,814.40

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Solution

The fourth proportional to 717,980.86, 990,639.57 and 407,814.40 is: 562,685.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,980.86 : 990,639.57 = 407,814.40 : x
  2. Step 2: Convert to fraction form
    717,980.86/990,639.57 = 407,814.40/x
  3. Step 3: Cross multiply
    717,980.86x = 990,639.57 × 407,814.40
  4. Step 4: Simplify right side
    717,980.86x = 403,997,081,855.81
  5. Step 5: Solve for x
    x = 403,997,081,855.81/717,980.86
  6. Step 6: Final answer
    x = 562,685.03

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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.