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Finding the Fourth Proportional to 715,587.36, 988,376.64 and 521,688

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Solution

The fourth proportional to 715,587.36, 988,376.64 and 521,688 is: 720,560.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,587.36 : 988,376.64 = 521,688 : x
  2. Step 2: Convert to fraction form
    715,587.36/988,376.64 = 521,688/x
  3. Step 3: Cross multiply
    715,587.36x = 988,376.64 × 521,688
  4. Step 4: Simplify right side
    715,587.36x = 515,624,232,568.32
  5. Step 5: Solve for x
    x = 515,624,232,568.32/715,587.36
  6. Step 6: Final answer
    x = 720,560.84

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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.