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Finding the Fourth Proportional to 621,009.20, 931,513.80 and 621,009.20

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Solution

The fourth proportional to 621,009.20, 931,513.80 and 621,009.20 is: 931,513.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,009.20 : 931,513.80 = 621,009.20 : x
  2. Step 2: Convert to fraction form
    621,009.20/931,513.80 = 621,009.20/x
  3. Step 3: Cross multiply
    621,009.20x = 931,513.80 × 621,009.20
  4. Step 4: Simplify right side
    621,009.20x = 578,478,639,726.96
  5. Step 5: Solve for x
    x = 578,478,639,726.96/621,009.20
  6. Step 6: Final answer
    x = 931,513.80

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.