Finding the Fourth Proportional to 717,909.64, 990,721.80 and 395,631.28
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Solution
The fourth proportional to 717,909.64, 990,721.80 and 395,631.28 is: 545,974.75
Step by Step Solution
- Step 1: Write the proportion equation
717,909.64 : 990,721.80 = 395,631.28 : x - Step 2: Convert to fraction form
717,909.64/990,721.80 = 395,631.28/x - Step 3: Cross multiply
717,909.64x = 990,721.80 × 395,631.28 - Step 4: Simplify right side
717,909.64x = 391,960,533,857.90 - Step 5: Solve for x
x = 391,960,533,857.90/717,909.64 - Step 6: Final answer
x = 545,974.75
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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.