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Finding the Fourth Proportional to 640,368.76, 883,685.02 and 368,478.70

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Solution

The fourth proportional to 640,368.76, 883,685.02 and 368,478.70 is: 508,486.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,368.76 : 883,685.02 = 368,478.70 : x
  2. Step 2: Convert to fraction form
    640,368.76/883,685.02 = 368,478.70/x
  3. Step 3: Cross multiply
    640,368.76x = 883,685.02 × 368,478.70
  4. Step 4: Simplify right side
    640,368.76x = 325,619,107,379.07
  5. Step 5: Solve for x
    x = 325,619,107,379.07/640,368.76
  6. Step 6: Final answer
    x = 508,486.87

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Double scale
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1.5x scale

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.