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Finding the Fourth Proportional to 674,387.40, 930,643.74 and 368,457.21

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Solution

The fourth proportional to 674,387.40, 930,643.74 and 368,457.21 is: 508,465.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    674,387.40 : 930,643.74 = 368,457.21 : x
  2. Step 2: Convert to fraction form
    674,387.40/930,643.74 = 368,457.21/x
  3. Step 3: Cross multiply
    674,387.40x = 930,643.74 × 368,457.21
  4. Step 4: Simplify right side
    674,387.40x = 342,902,395,944.37
  5. Step 5: Solve for x
    x = 342,902,395,944.37/674,387.40
  6. Step 6: Final answer
    x = 508,465.01

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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.