Finding the Fourth Proportional to 687,748,820.60, 1,031,623,230.90 and 442,860,807.80
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Solution
The fourth proportional to 687,748,820.60, 1,031,623,230.90 and 442,860,807.80 is: 664,291,211.70
Step by Step Solution
- Step 1: Write the proportion equation
687,748,820.60 : 1,031,623,230.90 = 442,860,807.80 : x - Step 2: Convert to fraction form
687,748,820.60/1,031,623,230.90 = 442,860,807.80/x - Step 3: Cross multiply
687,748,820.60x = 1,031,623,230.90 × 442,860,807.80 - Step 4: Simplify right side
687,748,820.60x = 456,865,497,381,619,904 - Step 5: Solve for x
x = 456,865,497,381,619,904/687,748,820.60 - Step 6: Final answer
x = 664,291,211.70
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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.